A119045 Triangular numbers composed of digits {0,1,8}.

1, 10, 1081, 8001, 10011, 81810, 108811, 1188111, 8018010, 8801110, 10888111, 80118811, 88000011, 800180010, 881811010, 1088881111, 10808101800, 80001800010, 81108010180, 108888811111, 810008010801, 880818181011, 888000000111, 8000018000010, 10888888111111

Offset

1,2

Links

Table of n, a(n) for n=1..25.

Giovanni Resta, Tridigital Triangular Numbers

Formula

a(n) = A000217(A119046(n)). - Michel Marcus, Mar 11 2023

Mathematica

Rest[Select[FromDigits/@Tuples[{0, 1, 8}, 12], OddQ[Sqrt[8#+1]]&]] (* or *) Select[Accumulate[Range[1328*10^3]], SubsetQ[{0, 1, 8}, IntegerDigits[ #]]&](* Harvey P. Dale, May 06 2019 *)

Crossrefs

Cf. A000217, A058422, A119046. See A119033 for a table of cross-references.

Sequence in context: A190945 A226553 A054609 * A339714 A069886 A133383

Adjacent sequences: A119042 A119043 A119044 * A119046 A119047 A119048

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Extensions

a(23)-a(25) from Tyler Busby, Mar 11 2023

Status

approved